Optical Framer Time Slot Allocation for Subcarrier Failure Resilience
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Solution Overview
Problem
In optical transport networks (OTNs), the increased traffic and capacity demands lead to challenges in maintaining communication when one optical subcarrier malfunctions, causing traffic disruption across a wider frequency band due to the interdependence of multiple parallel signals transmitted by optical subcarriers.
Innovation Solution
A framer and optical transmission device that utilize a storage unit for time slot and path accommodation information, an allocation processing unit to select optimal time slots for path allocation, and a multiplexing unit to manage client signals across multiple optical subcarriers, minimizing the number of subcarriers required for transmission and ensuring continuous communication even if one subcarrier fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple parallel signals are transmitted using multiple optical subcarriers to increase transmission capacity, then the transmission capacity is improved, but the reliability deteriorates because a single subcarrier malfunction causes traffic disruption across a wider frequency band
Solution Approach 1:
The patent segments the transmission system by allocating different client signals to different optical subcarriers. Each subcarrier operates independently, so when one subcarrier malfunctions, only the client signals assigned to that specific subcarrier are affected, while other subcarriers continue to transmit their assigned signals without disruption. This segmentation isolates the impact of failures and maintains overall system reliability.
2Speed
If optical subcarriers are used for multicarrier transmission to achieve higher speeds, then the transmission speed is improved, but the device complexity increases due to the need for managing multiple parallel signals and their correspondence
Solution Approach 1:
The patent applies preliminary action by establishing the correspondence between client signals and optical subcarriers in advance through allocation processing. The system pre-configures which client signals are assigned to which subcarriers, creating a predetermined mapping relationship. This preliminary allocation simplifies the management of multiple parallel signals during transmission, as the correspondence is already established before the actual data transmission begins.
Data Source
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AI summary
There is provided a framer which is connected to a plurality of transmitters that multicarrier-transmit a plurality of parallel signals by optical subcarriers. The framer selects time slots to be allocated to a path to be accommodated such that the number of optical subcarriers corresponding to the time slots satisfies a predetermined condition on the basis of empty time slots which are specified by path accommodation information indicating a correspondence between paths allocated to a client signal and time slots in a signal frame and the optical subcarriers corresponding to the empty time slots indicated by time slot information indicating a correspondence between the time slots and the optical subcarriers, and sets the selected time slot in the path accommodation information. The framer sets a client signal to the time slots on the basis of the path accommodation information.